US4678699A
Expired / Lapsed
US
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Stampable polymeric composite containing an EMI/RFI shielding layer
Assignee: Honeywell International Inc
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Filing: 1985-01-11
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Granted: 1987-07-07
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Expires: 2005-01-11
Abstract
Abstract A stampable thermoplastic composite having at least one thermoplastic layer and at least one shielding layer. The shielding layer comprises a material having an elongation to break of at least 8 percent, and the composite having an EMI/RFI shielding effectiveness of at least 30 db.
Inventors
- 👤 Gina R. Kritchevsky
- 👤 John A. Gregor
- 👤 Manfred W. Gruendig
- 👤 Gregory J. Sellers
- 👤 Barbara Liss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:35
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0073; H05K9/0081; H05K9/0086; B; B29; B29C; B29C51/00; B29C51/14; B29C51/145; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/086; B29C70/88; B29C70/882; B29C70/885; H05K9/009; B29C70/68; B29C70/685; B29C70/687; B29K; B29K2105/00; B29K2105/06; B29K2105/20; B29K2105/206; B29K2995/00; B29K2995/0003; B29K2995/0005; B29K2995/0037; B29K2995/0077; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24636; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/109; Y10T442/116; Y10T442/30; Y10T442/3707; Y10T442/378; Y10T442/3846
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
74 words
A stamped thermoplastic composite comprising: at least one thermoplastic layer; and at least one shielding layer, the shielding layer comprising at least one layer of thermoplastic woven fiber containing metal fiber and having an elongation to break of at least 8 percent and an EMI/RFI shielding effectiveness of at least 30 dB, and the stamped composite having been elongated at least 8 percent without holes formed by tearing of the shielding layer during stamping.
Claim 2
Dependent Claim
74 words
A stamped thermoplastic composite comprising: at least one thermoplastic layer; and at least one shielding layer, the shielding layer comprising at least one layer of thermoplastic woven fiber containing metal fiber and having an elongation to break of at least 8 percent and an EMI/RFI shielding effectiveness of at least 30 dB, and the stamped composite having been elongated at least 8 percent without holes formed by tearing of the shielding layer during stamping.
Claim 3
Dependent Claim
19 words
The stamped thermoplastic composite as recited in claim 1 wherein the shielding layer is adjacent to the thermoplastic layer.
Claim 4
Dependent Claim
19 words
The stamped thermoplastic composite as recited in claim 1 wherein the shielding layer is embedded in the thermoplastic layer.
Claim 5
Dependent Claim
16 words
The stamped thermoplastic composite as recited in claim 1 wherein the thermoplastic layer is a polyamide.
Claim 6
Dependent Claim
14 words
The stamped thermoplastic composite as recited in claim 4 further comprising a reinforcing layer.
Claim 7
Dependent Claim
44 words
The stamped thermoplastic composite as recited in claim 4 wherein the reinforcing layer contains 50 to 100 percent of a thermoplastic polymer on an extruded basis, from 0 to 50 percent of particulate filler, on an extruded basis, and a long glass fiber mat.
Claim 8
Dependent Claim
38 words
The stamped thermoplastic composite as recited in claims 4 and 5 wherein the thermoplastic layer comprises from 40 to 100 percent thermoplastic polymer, from 0 to 50 percent particulate filler and from 0 to 45 percent short fibers.
Claim 9
Dependent Claim
23 words
The stamped thermoplastic composite as recited in claim 5 wherein the shielding layer is located between the thermoplastic layer and the reinforcing layer.
Claim 10
Dependent Claim
43 words
The stamped thermoplastic composite as recited in claim 8 wherein the reinforcing layer has opposite surfaces and at least one opposite surface adjoins a thermoplastic layer and where there is a shielding layer between at least one thermoplastic layer and the reinforcing layer.
Claim 11
Dependent Claim
24 words
The stamped thermoplastic composite as recited in claim 1 wherein the shielding layer has an elongation to break of from 8 to 250 percent.
Claim 12
Dependent Claim
23 words
The stamped thermoplastic composite as recited in claim 1 wherein the composite has an EMI/RFI shielding effectiveness of from 40 to 75 dB.
Claim 13
Dependent Claim
26 words
The stamped thermoplastic composite as recited in claim 1 wherein the shielding layer comprises at least two adjacent layers of thermoplastic woven fiber containing metal fiber.
Claim 14
Dependent Claim
54 words
A stampable thermoplastic composite comprising: at least one thermoplastic layer; and at least one shielding layer, the shielding layer comprising at least one layer of thermoplastic woven fabric containing metal fiber having an elongation to break of at least 8 percent, and the composite having an EMI/RFI shielding effectiveness of at least 30 dB.
Claim 15
Dependent Claim
54 words
A stampable thermoplastic composite comprising: at least one thermoplastic layer; and at least one shielding layer, the shielding layer comprising at least one layer of thermoplastic woven fabric containing metal fiber having an elongation to break of at least 8 percent, and the composite having an EMI/RFI shielding effectiveness of at least 30 dB.
Claim 16
Dependent Claim
26 words
The stampable thermoplastic composite as recited in claim 13 wherein the shielding layer comprises at least two adjacent layers of thermoplastic woven fiber containing metal fiber.
Claim 17
Dependent Claim
26 words
The stampable thermoplastic composite as recited in claim 13 wherein the shielding layer comprises at least two adjacent layers of thermoplastic woven fiber containing metal fiber.
Claim 18
Independent Claim
80 words
A method comprising the step of stamping a thermoplastic composite comprising: at least one thermoplastic layer; and at least one shielding layer, the shielding layer comprising at least one layer of thermoplastic woven fiber containing metal fiber and having an elongation to break of at least 8 percent and an EMI/RFI shielding effectiveness of at least 30 dB, and the stamped composite having been elongated at least 8 percent without holes formed by tearing of the shielding layer during stamping.
Claim 19
Independent Claim
80 words
A method comprising the step of stamping a thermoplastic composite comprising: at least one thermoplastic layer; and at least one shielding layer, the shielding layer comprising at least one layer of thermoplastic woven fiber containing metal fiber and having an elongation to break of at least 8 percent and an EMI/RFI shielding effectiveness of at least 30 dB, and the stamped composite having been elongated at least 8 percent without holes formed by tearing of the shielding layer during stamping.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-06 | 1991-01-05 | 1991-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-06 | 1995-01-05 | 1995-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-06 | 1999-01-05 | 1999-07-07 | $7700.00 | Window Closed / Lapsed |